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Hardware options installation 40
NOTE: When an HP ProLiant DL980 G7 server is configured with a DIMM that has an
uninitialized SPD area, and the server is running any version of the System ROM detailed in the
Scope section below, the Survey Utility in HP SmartStart will report the "Correctable Error
Threshold Count" for the DIMM as "Feature Not Supported." However, this is incorrect. The
DIMM does actually support "Correctable Error Threshold Count." This issue is only observed
when using the Survey Tool in HP SmartStart. In addition, this issue does not affect the operation
or functionality of the server or of ECC. It only affects the reporting of ECC capabilities in the
DIMM SPD and does not impact any other system operation. Any ProLiant DL980 G7 server
configured with a P66 System ROM dated 07/07/2010, 07/27/2010, or 01/27/2011 and
using the Survey Tool in SmartStart (any version) may see this issue.
This is only a reporting issue and can be safely ignored. It does not affect the operation or
functionality of the server or of ECC. It only affects the reporting of ECC capabilities in the DIMM
SPD and does not impact any other system operation. To prevent this issue from occurring, or to
correct it after it has already occurred, update the System ROM to a version dated 03/24/2011
(or later).
DIMM support
The server supports the following DIMMs:
• Single- and dual-rank PC3-10600 (DDR3-1333) DIMMs operating at 1066 MT/s
While single-rank DIMMs are supported, HP recommends dual-rank and quad-rank DIMMs since they
provide significant memory throughput and better memory protection (Online Spare memory mode)
over single-rank DIMMs.
• Quad-rank PC3-8500 (DDR3-1066) DIMMs operating at 1066 MT/s
Single-, dual-, and quad-rank DIMMs
To understand and configure memory protection modes properly, an understanding of single-, dual-, and
quad-rank DIMMs is helpful. Some DIMM configuration requirements are based on these classifications.
A single-rank DIMM has one set of memory chips that is accessed while writing to or reading from the
memory. A dual-rank DIMM is similar to having two single-rank DIMMs on the same module, with only one
rank accessible at a time. A quad-rank DIMM is effectively two dual-rank DIMMs on the same module. Only
one rank is accessible at a time. The server memory control subsystem selects the proper rank within the
DIMM when writing to or reading from the DIMM.
Dual- and quad-rank DIMMs provide the greatest capacity with the existing memory technology. For
example, if current DRAM technology supports 2-GB single-rank DIMMs, a dual-rank DIMM would be 4-GB
and a quad-rank DIMM would be 8-GB.
Although only one data rank is accessed at any given time for each DIMM, optimized command and address
pipelining via various interleaving schemes enables the Intel® Xeon™ 7500-series processor architecture to
benefit from dual-rank and quad-rank DIMMs. A dual-rank DIMM performs significantly better than its
single-rank counterpart. A quad-rank DIMM provides further performance improvement even at the same
DIMM capacity.